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学者姓名：郑兴华
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Abstract ：
In this paper, a strategy for preparing MgAl2-x(Mg0.5Ge0.5)xO4 (0 ≤ x ≤ 0.12) solid solution ceramics through the substitution of (Mg0.5Ge0.5)3+ for Al3+ in the octahedral lattice of spinel crystal structure A(tetra)B2(octa)O4 via traditional high-temperature solid-state reaction method is presented. The intrinsic and extrinsic factors influencing their microwave dielectric properties, including the inversion degree of A/B lattice sites (lattice occupancy), bond length and bond valence, as well as grain sizes, were investigated using Rietveld refinement of X-ray powder diffraction data and scanning electron microscopy. To verify the applicability for the next-generation 5 G-n257/n258 millimeter wave frequency band, the Q×f values were tested within the frequency range of 12–25 GHz. Notably, MgAl1.91(Mg0.5Ge0.5)0.09O4 ceramics exhibited a high Q×f value of 105, 384 GHz @11.83 GHz, low Εr of 8.7, and τf of −66.4 ppm/℃. SrTiO3 was added to tune the τf to a near-zero value of +2.6 ppm/℃ with high Q×f value of 51, 152 GHz @11.53 GHz and Εr of 9.91. Finally, a microstrip filter with a center frequency of 3.6 GHz was designed using this composite ceramic, successfully demonstrating its practical application in the low-frequency band of 5 G networks. © 2024 Elsevier Ltd
Keyword ：
Bond length Bond length Crystal structure Crystal structure Dielectric materials Dielectric materials Dielectric properties Dielectric properties Magnesium compounds Magnesium compounds Microwave filters Microwave filters Millimeter waves Millimeter waves Rietveld refinement Rietveld refinement Scanning electron microscopy Scanning electron microscopy Solid state reactions Solid state reactions Titanium compounds Titanium compounds X ray powder diffraction X ray powder diffraction
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| GB/T 7714 | Han, Jiuyuan , Shi, Rengang , Ren, Yingjie et al. High quality, temperature stable MgAl2-x(Mg0.5Ge0.5)xO4 microwave dielectric ceramics: The dependence of microwave-millimeter-wave properties on the degree of inversion of A-B lattice sites [J]. | Journal of the European Ceramic Society , 2024 , 44 (15) . |
| MLA | Han, Jiuyuan et al. "High quality, temperature stable MgAl2-x(Mg0.5Ge0.5)xO4 microwave dielectric ceramics: The dependence of microwave-millimeter-wave properties on the degree of inversion of A-B lattice sites" . | Journal of the European Ceramic Society 44 . 15 (2024) . |
| APA | Han, Jiuyuan , Shi, Rengang , Ren, Yingjie , Cao, Lei , Wang, Liang , Zhou, Tao et al. High quality, temperature stable MgAl2-x(Mg0.5Ge0.5)xO4 microwave dielectric ceramics: The dependence of microwave-millimeter-wave properties on the degree of inversion of A-B lattice sites . | Journal of the European Ceramic Society , 2024 , 44 (15) . |
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Dielectric materials with colossal permittivity (CP, epsilon(r) > 10(4)) have attracted the increasing interest of researchers due to their enormous potential in the fields of sensor, capacitor, energy storage, etc. However, for the explored CP materials, their grains are too large to apply. To control grain growth, the sintering aids of MgO-Al2O3-SiO2 (MAS) cordierite glass and common suppression grain growth of MgO have been introduced to BaTiO3-0.004Y(2)O(3)-0.006MnO(2) ceramics derived from the commercial BaTiO3 powder with the average grain size of 300 nm. After controlling grain growth, the fine grains with the average grain size of d(g) similar to 300 nm and CP are achieved in BaTiO3 based ceramics sintered in reducing atmosphere. Notably, excellent temperature stability with Delta epsilon(r)/epsilon(r25 degrees C) lower than 17 % is gained for the present BaTiO3 based ceramics in the temperature range of -60 to 155 degrees C, meeting the X8S specification (Delta C/C-25 degrees C <=+/- 22 %, -55 degrees C-150 degrees C). Based on the X-ray photoelectron spectroscopy (XPS) and Raman spectra, the outstanding dielectric properties of the present BaTiO3 based ceramics is ascribed to the electron-pinned defect-dipole (EPDD) effect induced by Y-Ti '-Y-Ba(center dot ), Ti-Ti '-V-o(center dot center dot)-Ti-Ti ' and Y-Ti '-V-o(center dot center dot)-Ti-Ti ' defect dipoles. The present BaTiO3 based fine ceramics with colossal permittivity (similar to 2.9 x 10(4)), low loss (similar to 0.03) at 1 kHz and room temperature, excellent temperature stability and high resistivity of 3.54 x 10(9) Omega cm is a promising candidate for the multilayer ceramics capacitor (MLCC).
Keyword ：
Barium titanate Barium titanate Colossal permittivity Colossal permittivity Defect dipole Defect dipole Fine grain Fine grain Temperature stability Temperature stability
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| GB/T 7714 | Mo, Shaoyu , Tang, Chuang , Zhang, Huan et al. Colossal permittivity and excellent temperature stability of BaTiO3 based fine ceramics with controlled grain growth [J]. | CERAMICS INTERNATIONAL , 2024 , 50 (7) : 11980-11988 . |
| MLA | Mo, Shaoyu et al. "Colossal permittivity and excellent temperature stability of BaTiO3 based fine ceramics with controlled grain growth" . | CERAMICS INTERNATIONAL 50 . 7 (2024) : 11980-11988 . |
| APA | Mo, Shaoyu , Tang, Chuang , Zhang, Huan , Zhu, Peishu , Wang, Nanlan , Wen, Xiao et al. Colossal permittivity and excellent temperature stability of BaTiO3 based fine ceramics with controlled grain growth . | CERAMICS INTERNATIONAL , 2024 , 50 (7) , 11980-11988 . |
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In this paper, a strategy for preparing MgAl2-x(Mg0.5Ge0.5)(x)O-4 (0 <= x <= 0.12) solid solution ceramics through the substitution of (Mg0.5Ge0.5)(3+) for Al3+ in the octahedral lattice of spinel crystal structure A(tetra)B-2(octa)O-4 via traditional high-temperature solid-state reaction method is presented. The intrinsic and extrinsic factors influencing their microwave dielectric properties, including the inversion degree of A/B lattice sites (lattice occupancy), bond length and bond valence, as well as grain sizes, were investigated using Rietveld refinement of X-ray powder diffraction data and scanning electron microscopy. To verify the applicability for the next-generation 5 G-n257/n258 millimeter wave frequency band, the Qxf values were tested within the frequency range of 12-25 GHz. Notably, MgAl1.91(Mg0.5Ge0.5)(0.09)O-4 ceramics exhibited a high Qxf value of 105, 384 GHz @11.83 GHz, low epsilon(r) of 8.7, and tau(f) of -66.4 ppm/degree celsius. SrTiO3 was added to tune the tau(f) to a near-zero value of +2.6 ppm/degree celsius with high Qxf value of 51, 152 GHz @11.53 GHz and epsilon(r) of 9.91. Finally, a microstrip filter with a center frequency of 3.6 GHz was designed using this composite ceramic, successfully demonstrating its practical application in the low-frequency band of 5 G networks.
Keyword ：
5 G communication 5 G communication Inversion degree Inversion degree MgAl 2 O- 4 MgAl 2 O- 4 Microwave dielectric ceramics Microwave dielectric ceramics
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| GB/T 7714 | Han, Jiuyuan , Shi, Rengang , Ren, Yingjie et al. High quality, temperature stable MgAl2-x(Mg0.5Ge0.5)xO4 microwave dielectric ceramics: The dependence of microwave-millimeter-wave properties on the degree of inversion of A-B lattice sites [J]. | JOURNAL OF THE EUROPEAN CERAMIC SOCIETY , 2024 , 44 (15) . |
| MLA | Han, Jiuyuan et al. "High quality, temperature stable MgAl2-x(Mg0.5Ge0.5)xO4 microwave dielectric ceramics: The dependence of microwave-millimeter-wave properties on the degree of inversion of A-B lattice sites" . | JOURNAL OF THE EUROPEAN CERAMIC SOCIETY 44 . 15 (2024) . |
| APA | Han, Jiuyuan , Shi, Rengang , Ren, Yingjie , Cao, Lei , Wang, Liang , Zhou, Tao et al. High quality, temperature stable MgAl2-x(Mg0.5Ge0.5)xO4 microwave dielectric ceramics: The dependence of microwave-millimeter-wave properties on the degree of inversion of A-B lattice sites . | JOURNAL OF THE EUROPEAN CERAMIC SOCIETY , 2024 , 44 (15) . |
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In this work, phase-pure Mg-1.8(Ni1-xCox)(0.2)Al4Si5O18 (0 <= x <= 1) ceramics were synthesized by a high-temperature solid-state method. On the basis of Rietveld refinement data of X-ray powder diffraction and Phillips-Vechten-Levine theory, the atomic ionicity, lattice energy, and bond energy of the compound were calculated to explore their influence on the microwave dielectric properties of ceramics. The Mg1.8Ni0.1Co0.1Al4Si5O18 (x = 0.5) ceramic exhibited the best microwave dielectric properties: epsilon(r) = 4.44, Qf = 73 539 GHz@13 GHz, and tau(f) = -23.9 ppm/degrees C. (Ni1-xCox)(2+) complex ionic doping, compared with only Ni2+ or Co2+, is beneficial for improving the symmetry of [Si4Al2O18] hexagonal rings and reducing distortion. Subsequently, 8 wt % TiO2 was added to Mg1.8Ni0.1Co0.1Al4Si5O18, resulting in a near-zero tau(f) and high Qf values for the composite ceramic, with epsilon(r) = 5.22, Qf = 58 449 GHz@13 GHz, and tau(f) = -2.06 ppm/degrees C. Finally, a 5G millimeter-wave antenna with a central operating frequency of 25.52 GHz was designed and fabricated using the Mg1.8Ni0.1Co0.1Al4Si5O18-8 wt % TiO2 ceramics. Operating in the 24.7-26.0 GHz range, it demonstrated favorable radiation characteristics with a simulated efficiency of 85.2% and a gain of 4.58 dBi. The antenna's performance confirms the high potential of the cordierite composite for application in 5G communication systems.
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| GB/T 7714 | Yao, Yang , Wang, Yuanyuan , Bafrooei, Hadi Barzegar et al. Ni-Co Complex Ionic Synergistically Modifying Octahedron Lattice of Cordierite Ceramics for the Application of 5G Microwave-Millimeter-wave Antennas [J]. | INORGANIC CHEMISTRY , 2024 , 63 (21) : 10022-10030 . |
| MLA | Yao, Yang et al. "Ni-Co Complex Ionic Synergistically Modifying Octahedron Lattice of Cordierite Ceramics for the Application of 5G Microwave-Millimeter-wave Antennas" . | INORGANIC CHEMISTRY 63 . 21 (2024) : 10022-10030 . |
| APA | Yao, Yang , Wang, Yuanyuan , Bafrooei, Hadi Barzegar , Mao, Minmin , Liu, Bing , Lu, Zhilun et al. Ni-Co Complex Ionic Synergistically Modifying Octahedron Lattice of Cordierite Ceramics for the Application of 5G Microwave-Millimeter-wave Antennas . | INORGANIC CHEMISTRY , 2024 , 63 (21) , 10022-10030 . |
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Due to the increasingly urgent safety and energy density concerns of lithium-ion batteries, more and more attention has been attracted by the Li7La3Zr2O12 (LLZO)-based solid electrolytes with high ion conductivity and chemical stability against Li-metal. However, to prepare the high-quality LLZO ceramic electrolyte with high-ion conductivity and density, there is still a big challenge of the serious "Li-loss" and the abnormal grain growth during the long-time high-temperature sintering process. A novel covered sintering method is put forward to prepare the high-quality Mo-doped LLZO (LLZMO) ceramic electrolyte. The sintering strategy effectively suppresses the Li-loss to obtain the LLZMO dense ceramics with cubic garnet phase and tight grain boundaries. The LLZMO ceramics sintered at lower temperature of 1050 degrees C for 2 h via the novel covered sintering exhibit high density (rho(r) = 92.3%) and high-ionic conductivity of 6.08 x 10(-4) S cm(-1) at 25 degrees C, which are close to those of LLZO-based ceramics prepared by hot pressing sintering, ultrafast high-temperature sintering (UHS). The novel covered sintering provides an energy-saving, low-cost and high-efficient strategy to prepare the high-quality LLZO-based ceramics electrolyte.
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| GB/T 7714 | Gong, Zonggui , Wang, Nanlan , Guo, Haoxuan et al. Sintering mechanism and greatly enhanced ionic conductivity of Mo-doped Li7La3Zr2O12 ceramics via a novel covered sintering [J]. | JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS , 2024 , 35 (9) . |
| MLA | Gong, Zonggui et al. "Sintering mechanism and greatly enhanced ionic conductivity of Mo-doped Li7La3Zr2O12 ceramics via a novel covered sintering" . | JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS 35 . 9 (2024) . |
| APA | Gong, Zonggui , Wang, Nanlan , Guo, Haoxuan , Zhu, Peishu , Wang, Qijing , Yu, Hang et al. Sintering mechanism and greatly enhanced ionic conductivity of Mo-doped Li7La3Zr2O12 ceramics via a novel covered sintering . | JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS , 2024 , 35 (9) . |
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Sintering characteristics, phase evolutions, microstructures, and microwave dielectric properties have been investigated for BaTi4O9 ceramics prepared by traditional low temperature sintering using CuO-TiO2 (CT) additions as aids. The sintering temperature of BaTi4O9 ceramics was found to evidently reduce from 1350 degrees C to about 1100 degrees C with a very small amount of 0.5 wt% CT addition. When the CT addition increased to beyond 0.5 wt%, however, it was not expected to further lower the sintering temperature. Meantime, the secondary phases of Ba4Ti13O30, BaTiO3, and TiO2 were observed in these BaTi4O9-based ceramics when the CT content was beyond 2 wt%. With the introduction of the CT addition, the permittivity (epsilon) had little enhancement, and the temperature coefficient of the resonant frequency (tau(f)) was improved to near zero. The BaTi4O9 ceramics with 0.5 wt% CT additions, sintered at 1100 degrees C, exhibited excellent microwave dielectric properties, such as epsilon = 36.9, Q x f = 23100 GHz, and tau(f) = 2.5 ppm/degrees C. In addition, the densification mechanism and variations of the microwave dielectric properties have also been discussed with the crystal phase and microstructure's evolution.
Keyword ：
BaTi4O9 BaTi4O9 CuO-TiO2 CuO-TiO2 microwave dielectric properties microwave dielectric properties sintering characteristics sintering characteristics
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| GB/T 7714 | Guo, Haoxuan , Zhu, Peishu , Lin, Qingping et al. Sintering Characteristics and Microwave Dielectric Properties of BaTi4O9 Ceramics with CuO-TiO2 Addition [J]. | CRYSTALS , 2023 , 13 (4) . |
| MLA | Guo, Haoxuan et al. "Sintering Characteristics and Microwave Dielectric Properties of BaTi4O9 Ceramics with CuO-TiO2 Addition" . | CRYSTALS 13 . 4 (2023) . |
| APA | Guo, Haoxuan , Zhu, Peishu , Lin, Qingping , Gao, Min , Tang, Deping , Zheng, Xinghua . Sintering Characteristics and Microwave Dielectric Properties of BaTi4O9 Ceramics with CuO-TiO2 Addition . | CRYSTALS , 2023 , 13 (4) . |
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CaCu3Ti4O12 (CCTO) is a potential dielectric material with giant permittivity, good stability over the wide temperature and frequency range. However, the dielectric responses of CCTO-based ceramics are mainly investigated in the frequency of 10(2)-10(6) Hz, which is far low to clarify the intrinsic dielectric feature. So, microwave dielectric properties have been investigated for the CCTO porous ceramics sintered at low temperature (<= 1000 degrees C). Good microwave dielectric properties of permittivity epsilon = 62.7, quality factor Qf = 3062 GHz and temperature coefficient of the resonant frequency tau(f) = 179 ppm/degrees C are achieved for the CCTO ceramics sintered at 1000 degrees C, the dielectric loss significantly decreases two orders to 0.002 compared to that of CCTO ceramics sintered at critical temperature of 1020 degrees C confirmed by differential scanning calorimetry (DSC). This clue indicates that giant permittivity and high loss is not intrinsic for CCTO ceramics, but derives from composition segregation, liquid phase and defects associated with internal barrier layer capacitor (IBLC). It suggests that CCTO-based ceramics is a promising microwave dielectric materials with high permittivity.
Keyword ：
CCTO CCTO dielectric mechanism dielectric mechanism microwave dielectric properties microwave dielectric properties sintering temperature sintering temperature
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| GB/T 7714 | Huang, X. , Guo, H. X. , Zhu, P. S. et al. Microwave dielectric properties of CaCu3Ti4O12 ceramics: A clue to its intrinsic dielectric response [J]. | JOURNAL OF ADVANCED DIELECTRICS , 2023 , 13 (05) . |
| MLA | Huang, X. et al. "Microwave dielectric properties of CaCu3Ti4O12 ceramics: A clue to its intrinsic dielectric response" . | JOURNAL OF ADVANCED DIELECTRICS 13 . 05 (2023) . |
| APA | Huang, X. , Guo, H. X. , Zhu, P. S. , Liu, L. , Xiao, J. , Tang, D. P. et al. Microwave dielectric properties of CaCu3Ti4O12 ceramics: A clue to its intrinsic dielectric response . | JOURNAL OF ADVANCED DIELECTRICS , 2023 , 13 (05) . |
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本发明公开了一种提高锂镧锆氧立方相稳定性的方法，采用MoO3置换Li7La3Zr2O12中部分ZrO2，制得Li7‑2xLa3Zr2‑xMoxO12，0<x≤0.1。与Li7La3Zr2O12相比，Li7‑2xLa3Zr2‑xMoxO12电解质片不容易产生杂相，具有高纯度的石榴石立方相，具备高离子电导率，简化了制备工艺，在锂离子电池领域和中低温燃料电池方面具有很好的工业生产潜力。
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| GB/T 7714 | 郑兴华 , 王其竞 , 郭昊轩 . 一种提高锂镧锆氧立方相稳定性的方法 : CN202111184124.6[P]. | 2021-10-11 00:00:00 . |
| MLA | 郑兴华 et al. "一种提高锂镧锆氧立方相稳定性的方法" : CN202111184124.6. | 2021-10-11 00:00:00 . |
| APA | 郑兴华 , 王其竞 , 郭昊轩 . 一种提高锂镧锆氧立方相稳定性的方法 : CN202111184124.6. | 2021-10-11 00:00:00 . |
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本发明涉及一种低成本、低损耗和温度超稳定型介质材料及制备方法，包括：1)将BaTiO3粉体与Y2O3粉体混合、球磨、烘干、预烧，得到陶瓷粉体；2)在陶瓷粉体中加入MgO和CaSiO3，球磨后经烘干、造粒、成型、排胶、烧结，得到温度超稳定型介质材料。该介质材料在‑55℃~125℃范围内均满足了容温变化率≤±3.3%，满足X7D型温度稳定特性，其中最优实例可满足容温变化率≤±1.97%，满足X7C型温度稳定特性，成功制备出温度超稳定型介质材料；介电常数高，室温下介电常数>1210；介电损耗极低，室温下介电损耗≤0.71%；体系不含铅，改性剂成本低、掺杂成分少、工艺流程简单，可进行大规模生产应用。
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| GB/T 7714 | 郑兴华 , 莫少宇 , 朱培树 et al. 一种低成本、低损耗和温度超稳定型介质材料及制备方法 : CN202310254606.7[P]. | 2023-03-16 00:00:00 . |
| MLA | 郑兴华 et al. "一种低成本、低损耗和温度超稳定型介质材料及制备方法" : CN202310254606.7. | 2023-03-16 00:00:00 . |
| APA | 郑兴华 , 莫少宇 , 朱培树 , 王南兰 , 汤闯 . 一种低成本、低损耗和温度超稳定型介质材料及制备方法 : CN202310254606.7. | 2023-03-16 00:00:00 . |
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由于在-55～150℃存在正交-四方和四方-立方相变,相变对应的尖锐介电峰使BaTiO3陶瓷介电性能难以满足X8R温度稳定性要求.本文采用50 nm的纳米BaTiO3粉体和少量堇青石(MgO-Al2O3-SiO2,MAS)玻璃,制备了满足X8R介电温度特性的BaTiO3基细晶陶瓷.结果表明,随着MAS玻璃的加入,BaTiO3基陶瓷的室温晶体结构从四方相转变成赝立方相,平均晶粒尺寸从纯BaTiO3陶瓷的1.904μm显著降低到添加0.5％(质量分数)MAS玻璃的BaTiO3基陶瓷的183 nm.与此同时,BaTiO3基陶瓷虽然介电常数有所下降,但是介电损耗和介电性能的温度稳定性大幅度改善.其中添加0.5％MAS玻璃的BaTiO3基细晶陶瓷介电性能为:在1 kHz时室温介电常数为984,介电损耗为0.0065,满足X8R温度特性要求.
Keyword ：
BaTiO3 BaTiO3 MAS玻璃 MAS玻璃 X8R X8R 介电性能 介电性能 介电损耗 介电损耗 细晶 细晶
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| GB/T 7714 | 戴书云 , 钟诗琪 , 张欢 et al. X8 R型BaTiO3基细晶陶瓷的制备、结构和性能 [J]. | 硅酸盐通报 , 2022 , 41 (12) : 4412-4418 . |
| MLA | 戴书云 et al. "X8 R型BaTiO3基细晶陶瓷的制备、结构和性能" . | 硅酸盐通报 41 . 12 (2022) : 4412-4418 . |
| APA | 戴书云 , 钟诗琪 , 张欢 , 朱培树 , 李甜 , 刘杰 et al. X8 R型BaTiO3基细晶陶瓷的制备、结构和性能 . | 硅酸盐通报 , 2022 , 41 (12) , 4412-4418 . |
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